* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

::before,
::after {
    box-sizing: border-box;
}

ol,
li {
    list-style: none;
}

body {
    color: red;
}

#page {
    display: flex;
    flex-wrap: wrap;
}

#page>div {
    width: 50%;
    height: 50vh;
    border: 1px solid red;
}